使用zmq多次通信

使用zmq通信，client发送消息到server2，server2接收到消息后发送给server1

client.c

#include <zmq.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>

int main ()
{
        void *context = zmq_init (1);
        printf ("Connecting to hello world server...\n");
        void *requester = zmq_socket (context, ZMQ_DEALER);
        zmq_connect (requester, "tcp://localhost:9999");
        int request_nbr;
        while(1)
        {
                zmq_msg_t request;
                zmq_msg_init_data (&request, "Hello", 6, NULL, NULL);
                printf ("Sending request %d...\n", request_nbr);
                zmq_send (requester, &request, sizeof(request), 0);
                zmq_msg_close (&request);
                sleep(1);
        }
        zmq_close(requester);
        zmq_term(context);
        return 0;
}

server1.c

#include <zmq.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>

int main ()
{
        void *context1 = zmq_init (1);
        printf ("Connecting to hello world server...\n");
        void *requester1 = zmq_socket (context1, ZMQ_DEALER);
        zmq_connect (requester1, "tcp://localhost:9999");
        int request_nbr;
        while(1)
        {
                zmq_msg_t reply;
                zmq_msg_init (&reply);
                zmq_recv (requester1, &reply, sizeof(reply), 0);
                printf ("Received reply %d: [%s]\n", request_nbr, (char *)
                zmq_msg_data (&reply));
                zmq_msg_close (&reply);
        }
        zmq_close (requester1);
        zmq_term (context1);
        return 0;
}

server2.c

#include <stdio.h>
#include <zmq.h>
#include <string.h>
#include <stdlib.h>


int main()
{
        void *pCtx = NULL;
        void *pSock = NULL;
        const char *pAddr = "tcp://*:9999";
        if ((pCtx = zmq_ctx_new()) == NULL)
        {
                return 0;
        }
        if ((pSock = zmq_socket(pCtx, ZMQ_DEALER)) == NULL)
        {
                zmq_ctx_destroy(pCtx);
                return 0;
        }
        int iRecvTimeout = 5000;

        if (zmq_setsockopt(pSock, ZMQ_RCVTIMEO, &iRecvTimeout, sizeof(iRecvTimeout)) < 0)
        {
                zmq_close(pSock);
                zmq_ctx_destroy(pCtx);
                return 0;
        }
        if (zmq_bind(pSock, pAddr) < 0)
        {
                zmq_close(pSock);
                zmq_ctx_destroy(pCtx);
                return 0;
        }

        while (1)
        {
                char szMsg[1024] = {0};
                printf("waitting...\n");
                errno = 0;
                if (zmq_recv(pSock, szMsg, 1024, 0) < 0)
                {
                        printf("errno = %s\n", zmq_strerror(errno));
                        continue;
                }
                char buf[] = "hello";
                zmq_send(pSock, buf, sizeof(buf), 0);
                printf("received message: %s\n", szMsg);
        }
        return 0;
}